标签控制值消失了 [英] Label control value disappeared

问题描述

我在aspx页面上有2个文本框，一个标签控件和一个按钮。我想在按钮onclientclick事件的标签控件上显示两个文本框的结果。



我有一个web方法，我从javascript函数调用这个方法。 />


问题是当我在标签控件中分配结果（即总和）时，它只能看到1秒甚至更短的时间并消失。在此之后甚至没有服务器事件被解雇。

你能帮忙。

我的代码如下：

 <   script     type   =  text / javascript >  
  function  CallSum（）{
  var  Num1 = $ get（'  TextBox1'）; 
  var  Num2 = $ get（'  TextBox2 ）; 
  var  lblControl = $ get（'  lblResult ）; 
 
  //  呼叫服务器端功能 
 PageMethods.Sum（ Num1.value，Num2.value，CallSuccess，CallFailed，lblControl）; 
} 
  function  CallSuccess（result，lblControl）{
  //  在lblresult中显示结果 
  lblControl.innerHTML =结果;  
} 
 
  function  CallFailed（result，lblControl）{
  if （result！==  null ）{
 alert（result.get_message（））; 
} 
} 
 <   /   script  >  
第一个数字<   asp：TextBox     ID   =  TextBox1    runat   =  server >  <   / asp：TextBox  >  <   br     /  >  
秒数<   asp：TextBox     ID   =  TextBox2    runat   =  server >  <   / asp：TextBox  >  <   br     /  >  
 
结果= <   asp：标签    ID   =  lbl结果    ClientIDMode   = 静态    runat   =  server >  <   / asp：标签 >  <   br     /  >  
 <   asp：按钮    ID   =  button1    runat   =  server   文本  = 获取SUM    OnClientClick   =  return CallSum（）;    /  >  

和服务器方法是：

 [System.Web .Services.WebMethod] 
  public   static   int  Sum（ int  n1， int  n2）
 {
 < span class =code-keyword> try  { return  n1 + n2; } 
 
  catch （Exception ex）{ throw  ex; } 
} 

提前致谢。

Vivek。

解决方案

< blockquote> get（' TextBox1'）;
var Num2 =

get（' < span class =code-string> TextBox2'）;
var lblControl =

get（' < span class =code-string> lblResult'）;

// 呼叫服务器端功能
PageMethods.Sum（ Num1.value，Num2.value，CallSuccess，CallFailed，lblControl）;
}
function CallSuccess（result，lblControl）{
// 在lblresult中显示结果
lblControl.innerHTML =结果;
}

function CallFailed（result，lblControl）{
if （result！== null ）{
alert（result.get_message（））;
}
}
< / script >
第一个数字< asp：TextBox ID = TextBox1 runat = server > < / asp：TextBox > < br / >
秒数< asp：TextBox ID = TextBox2 runat = server > < / asp：TextBox > < br / >

结果= < asp：标签 ID = lbl结果 ClientIDMode = 静态 runat = server > < / asp：标签 > < br / >
< asp：按钮 ID = button1 runat = server 文本 = 获取SUM OnClientClick = return CallSum（）; / >

和服务器方法是：

 [System.Web .Services.WebMethod] 
  public   static   int  Sum（ int  n1， int  n2）
 {
 < span class =code-keyword> try  { return  n1 + n2; } 
 
  catch （Exception ex）{ throw  ex; } 
} 

提前致谢。

Vivek。

Hi,

I have 2 textboxes ,one label control and one button on aspx page. I want to display result of two textboxes on the label control on buttons onclientclick event.

I have one web method and I am calling this method from javascript function.

Problem is that when I assign result(ie sum) in the label control then it visible only for 1 second even less than that and disappears. Even no server event is being fired after that.
can you please help.
My code is given below:

  <script type="text/javascript">
        function CallSum() {
            var Num1 = $get('TextBox1');
            var Num2 = $get('TextBox2');
            var lblControl = $get('lblResult');

            //call server side function
            PageMethods.Sum(Num1.value, Num2.value, CallSuccess, CallFailed, lblControl);
        }
          function CallSuccess(result, lblControl) {
            //Show the result in lblresult
                lblControl.innerHTML = result;
           }

        function CallFailed(result, lblControl) {
            if (result !== null) {
                alert(result.get_message());
            }
        }
    </script>
First Number<asp:TextBox ID="TextBox1" runat="server"></asp:TextBox><br />
   Second Number<asp:TextBox ID="TextBox2" runat="server"></asp:TextBox><br />

   Result = <asp:Label ID="lblResult" ClientIDMode="Static" runat="server"></asp:Label><br />
   <asp:Button ID="button1" runat="server" Text="Get SUM" OnClientClick="return CallSum();" />

and server method is:

[System.Web.Services.WebMethod]
        public static int Sum(int n1, int n2)
        {
            try { return n1 + n2; }

            catch (Exception ex) { throw ex; }
        }

Thanks in advance.
Vivek.

解决方案

get('TextBox1'); var Num2 =

get('TextBox2'); var lblControl =

get('lblResult'); //call server side function PageMethods.Sum(Num1.value, Num2.value, CallSuccess, CallFailed, lblControl); } function CallSuccess(result, lblControl) { //Show the result in lblresult lblControl.innerHTML = result; } function CallFailed(result, lblControl) { if (result !== null) { alert(result.get_message()); } } </script> First Number<asp:TextBox ID="TextBox1" runat="server"></asp:TextBox><br /> Second Number<asp:TextBox ID="TextBox2" runat="server"></asp:TextBox><br /> Result = <asp:Label ID="lblResult" ClientIDMode="Static" runat="server"></asp:Label><br /> <asp:Button ID="button1" runat="server" Text="Get SUM" OnClientClick="return CallSum();" />

and server method is:

[System.Web.Services.WebMethod]
        public static int Sum(int n1, int n2)
        {
            try { return n1 + n2; }

            catch (Exception ex) { throw ex; }
        }

Thanks in advance.
Vivek.

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